Highly efficient circularly polarized organic luminogens with a large dissymmetry factor of circularly polarized luminescence characteristics
| Project/Area Number |
26620165
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Organic and hybrid materials
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
Hirata Shuzo 東京工業大学, 物質理工学院, 助教 (20552227)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2016: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | Delayed fluorescence / TADF / CPL / Chirality / OLED / EL display / Display / Contrast / 熱活性化遅延蛍光 / 円偏光発光 / 2色性因子 / 非対称性因子 / 有機EL / 電界発光 / エレクトロルミネッセンス / g値 / 円二色性 / 蛍光量子収率 / 光学活性 / 量子科学計算 |
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| Outline of Final Research Achievements |
Three kinds of metal-free aromatic compounds (CPDF1-3) with a chiral carbon sandwiched between a donor moiety and an acceptor moiety were designed. They showed thermally activated delayed fluorescence (TADF) as well as circularly polarized luminescence (CPL) characteristics. (R)-CPDF3 and (S)-CPDF3 showed CPL with a dissymmetry factor of 4×10-4 in toluene solution. CPDF3 doped into π-conjugated host with large energy of the lowest triplet excited state displayed a photoluminescence quantum yield of 99%. An electroluminescence (EL) device having a 30 wt% CPDF3 doped π-conjugated host as an emitting layer showed an external EL quantum yield of 9.5%. With increasing the concentration of (R)-CPDF3 and (S)-CPDF3 in the emitting layer, intermolecular charge transfer transition largely contributed to TADF, causing a disappearance of CPL characteristics from the devices.
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Report
(4 results)
Research Products
(21 results)
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[Journal Article] Highly efficient blue electroluminescence based on thermally activated delayed fluorescence2015
Author(s)
Shuzo Hirata, Yumi Sakai, Kensuke Masui, Hiroyuki Tanaka, Sae Youn Lee, Hiroko Nomura, Nozomi Nakamura, Mao Yasumatsu, Hajime Nakanotani, Qisheng Zhang, Katsuyuki Shizu, Hiroshi Miyazaki, Chihaya Adachi
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Journal Title
Nat. Mater.
Volume: 14
Issue: 3
Pages: 330-336
DOI
Related Report
Peer Reviewed
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